Friction-driven chuck.



J. M. BODENE. FRICTION DRIVEN CHUCK. APPLICATION man APR.'20, 191s.

Patented Sept. 5, 1916.

l @we W@ UNITED STATES PATENT oFFicE.

JOHN M. BODENE, 0F CHICAGO, ILLINOIS, ASSIGNOBTO CHICAGO "FLEXIBLE SHAFTCOMPANY, OF CHICAGO, ILLINOIS, A CORPORATION 0F ILLINOIS.

FRICTION-DRIVEN CHUCK.

Specification of L etters Patent.

Application led April 20, 1916. Serial No. 92,366.

kpanying drawings, forming a part thereof.

This invention relates to a power-driven chuck designed for operating ascrew driver,

socket, wrench or other tool having analogous conditions of use.

The invention consists in the features and elements described and shownin the drawings, as indicated by the claims.

In the drawings z-Figure 1 is a side elevation partly in sectionillustrating a. chuck embodying this invention. Fig. 2 is a trans-Vverse section taken as indicatedv at line, 22, on Fig. 1.- Fig. is atransverse section taken as indicated atv line, 3 3, on Fig.

l. Fig. 4 is a detail section taken as indi-v cated at line, 4 4, onFig. 3. Fig.. 5 is ,a partial. vertical section similar to thecorresponding. sectional, portion of Fig. 1 and illustrating a modifiedconstruction. Fig. 6 is a detail vertical section showing anotherposition of the parts illustrated in Fig. 5.

The chuck which is the Vsubject of this invention is designed to bempower-driven from a. shaft whose terminal portion, is indicated at A.on Fig..1, and which may be Icontinuously rotated. The screw driver, B,

which is yoperated through the chuckv is shown in engagement with thehead of a screw indicated in dotted lines at C. Briefly the chuckconsists of two portions, namely,

a two-part shell,'D, which may be termed the driving member, and thetoolholder, E,

whichis the ultimate driven member and is.

shown concentrically mounted in the shell, D.

The shell, D, has a slightly tapered recess, Dl, with whose conical walla correspondingly tapered cone, F, frictionally engages. The' member, F,,is not a rcomplete cone, but only a short frustum thereof, and itslarger base is formed with a central stem, F1, which'telescopes into acentral bore, E1, of the tool holder, E, andalso serves to posiv tion acompression spring, G, coiled about it and reacting between the clutchmember, F, and the tool holder, E, for longitudinally separating them.'The purpose of this separation is to normally hold out of engagementthel clutch teeth or pins, Fzand E2,

motion from the member, F, to the member, f

E. The initial frictional engagementbetween theconical 'surface of themember, F, and the tapered recess of the shell, D, is effected by a flatcompression spring, I-I, re'- 4acting between the face of the member,F,"

Patented Sept. 5, 1916.

and an adjustable sleeve, D3, which is screwed into the lower end of theshell, D,

and locked in adjustment by a' lock nut, D4.' When the chuck is used onan ordinary drill press or other boring machine, the driving shaft', A,represents'the constantly rotating spindle of the machine arid carrieswith it the rigidly associated shell, D.- Such machines are providedwith manual adjusting means, whereby the table which carries the workrepresented inthe present case by' the screw, C, is `either movabletoward and from the end nof the spindle, A, or such spindle is movabletoward and from the table, so that thetwo parts are relatively adjustable. It will be evident that so long as the work, that is,thescrew, C, remains out of engagement with the screw driver blade, C,or such other tool as is carried in the holder, E, thesaid holder willhang loosely in the revolving sleeve, D3, its shoulder Es, engaging' theshoulder, D5, of said sleeve, and its driving pin, E2, being lthus heldouto engagement with the driving pin, F2, of

,thefriction clutch member, F. This relawithout stopping the `rotationof the spindle,

A, and the attached shell, D, of' the chuck. Thenl by moving thespindle, A., and the work, C, relatively still closer together andlightly bearing down upon his adjusting lever, or corresponding'element,he will causethe, spring, G, to becompressed, and will bring the pins,E2, into engagement with the pins, F2, thereby operativelyconnecting't'he holderyE, to the frusto-'conical member, F.

It will be understood that the torqu 'which willbe transmittedthroughthe fricmember, F. Thus the operator need not eX- .ert more pressure onthe spindle, A, than enough to insure that thetool, B, 1s kept engagedwith the head of the screw at C. ,'Ifhe member, F, being frictionallyengaged with the shell, D, will rotate therewithfthus serving to set thescrew, C, but when the latter has been screwed home the resistance toits further rotation will cause a slippage between the member, F, andthe shell, D, thus preventing injury to the screw; or to the screwdriver blade, B.

The screw driver blade, B, is of course removable from the holder, E,being non-rotatively engaged Vthereby in any suitable manner and beingheld in. engaged position by means of a set screw shown at E4. For

setting square-headed or heXagon-headed screws a socket wrench may besubstituted for the screw driver, B, but if it is desired to use themachine for drilling or tapping or other operations in which it is notdesirableto have the holder, E, normally disengaged from the member, F,these parts may be locked in engagement by settlng the screw, J, whichis carried in the sleeve, D3, into the groove, E5, in the holden-E, whenthe parts are positioned as shown in- Fig. l, thus preventing thedescent of the holder, E, or in other words, retaining the driving pins,E2, in engagement with the driving pins, F2, and holding the spring, G,compressed. It will be evident that so long as the parts, E and F, areprevented from separating -in axial direction, the. holder E, will notbe free torotate in the sleeve, D3, eX.- cept as it rotates with thepart, F, and said part will only rotate with respect to the shell, -D,and its sleeve, D3, in case of slippage at the frictional y engagedsurfaces of said parts.

Figs. 5 and 6- present a modification of the means4 for securingcontinuous en age-n` ment of the driving pins, E2 and F2, an thismodification consists in a'detent pin or plug, K, carried on the freeend of a flat spring. member, L, whose opposite end is secured. in asuitable recess formed in the sleeve, B30, which corresponds to thesleeve, B3, of Fig.

1'. Intermediate the pin, K, and-the screw,

L1, which secures the spring, L,'said spring is provided .with abushing, L2, threaded to receive an adjusting screw, M, whose inner endimpinges against the wall of the sleeve,` B30. As indicated at Fig.. 5,the screw, M, when set through the spring, L, forces the pin, K, out ofengagement with the groove,

The additional advantage-.of this m'odiication, however, is that theadjusting screw,

M, may be changed from the position shown in Fig. 5 to that shown inFig'. 6, regardless of therelative position of the roove, E5", so thatif at the time of such a justment the holder, E, is in its lowestposition with the groove, E5", out of registration with the pin, K, thatpin will be snapped into the groove, E50, the first time the holder, E,is moved up to cause registration of the groove with the pin; as, forexample, by bringing the tool carried in the holder, E, into engagementwith the .work upon which it is to operate. The pin, K, having onceengaged the groove, E50, it can only be releasedv by readjusting thescrew, M, to the position shown in Fig. 5.

1. A friction driven chuck comprising a driving element and a drivenele-ment frictionally engaged therewith, said driven element comprisingtwo parts adapted for relative endwise adjustment and formed withmutually engageable abutments Ion their adjacent ends, and a springpositioned to react.

between said parts for holding said abutments out of engagement.

2. A friction drivenchuck comprising a driving element and a drivenelement frictionally engaged therewith, said driven element comprisingtwo parts disengageably connected by a positive clutch device, yieldingmeans adapted for holding said positive clutch in disengaged position,and means for locking said positive clutch in engagement in oppositionto such yielding means.

3. A friction driven chuck comprising a driving element, a drivenelement frictionally engaged therewith, and a tool holder rotatablycarried by said driving element, said driven element and said' toolholder being provided with mutually engageable abutments constituting apositive clutch device for rotativelyconnecting them, yielding meanspositioned for normally holding said clutch device indisengagedrelation, and a stop on the driving element adjustable forengaging-the tool holder to prevent endwise movement thereof-for lockingthe. latter in engagement/Withthe said driven element.

4C. friction driven .chuck comprising a driving element, a drivenelement frictionally yengaged therewith, and-a tool holder rotatablycarried by' said driving element, said driven element and said toolholder being provided with mutually engageable abutments constitl'itingla positive clutch device:v for rotatively'- connecting them, yieldingmeans positioned fornormally holding said clutch deviceindisengagedrelation, and' lllla stop on the driving element adjustable topreventing its rotation insaizd driving eleengage the tool holder forpreventing endment.

wise movement thereof without preventing 6. A friction driven chuckcomprising a 4rotative movement of said holder in the driving element, adriven element frictiondriving element, said A tool holder being allyengaged therewith, and a tool holder formed for thus engaging with thestop rotatably carried by saidy driving element, when positioned inengagement with the said driven element yand said tool holder bedrivenelement. v ing providedl with mutually engageable .5. A friction drivenchuck comprising a abutments constituting a positive clutch'dedrivingelement, a driven elementV frictionvicefor rotatively connecting them,yield-Q ally engaged therewith, anda tool'holder ing means positionedfor normallyholding rotatably carried by said driving element, saidclutch device in disengaged relation, an

said driven element and said tool holder beadjustable stop on saiddriving element, and

ing provided with mutually engageable abutyielding means for causing theengagement ments constituting a positive clutch device thereof with thetool holder to prevent lendfor rotatively connecting them, yielding wisemovement of said holder, together with means positioned for normallyholding said adjusting means for positively withdrawing clutch device indisengaged relation, said said stop from engagement with sa'id holder.tool holder having a circumferential groove, ln testimony whereof I havehereunto set and a radially adjustable stop carried by theI my hand atChicago, Illinois, this 15th day driving element adapted tol engage saidof April, 1916,

groove Ifor locking said'tool holder in enj nagement with the drivenelement without J OHN M. BODENE.

